SBAA449B October   2020  – October 2021 TMAG5110 , TMAG5110-Q1 , TMAG5111 , TMAG5111-Q1

 

  1.   Trademarks
  2. 1Introduction
  3. 2Latch Response of the 2D Hall Effect
  4. 3Two Axis Sensor Consideration
    1. 3.1 Magnet Selection
      1. 3.1.1 Pole Count
      2. 3.1.2 Magnet Strength
    2. 3.2 Sensor Selection
      1. 3.2.1 Axes of Sensitivity
        1. 3.2.1.1 In-Plane Sensor Alignment
        2. 3.2.1.2 Out-Of Plane Sensor Alignment
      2. 3.2.2 Sensor Placement
        1. 3.2.2.1 On-Axis Magnetic Field
        2. 3.2.2.2 In-Plane Magnetic Field
        3. 3.2.2.3 Out-of-Plane Magnetic Field
      3. 3.2.3 Sensitivity Selection
  5. 4Optimizing for Accuracy
    1. 4.1 Optimizing Placement for Accuracy
    2. 4.2 Optimizing a Magnet for Accuracy
  6. 5Application Implementation
  7. 6Summary
  8. 7References
  9. 8Revision History

3.1.2 Magnet Strength

If constrained by placement and required resolution, it may be necessary to use a magnet material with stronger magnetization. In a similar fashion, we can compare the result of our bonded ceramic type magnet with that of N35 and SmCo18 type magnets. The placement beneath the outer edge of the magnet is used again, and only the material type is varied. Notice that the Neodymium type magnet offers a much greater peak amplitude than the molded ceramic magnet with an identical pole count.

GUID-20210108-CA0I-GKKT-VLT9-0J8TQ2TKNCFK-low.gifFigure 3-5 Variation of Magnetic Material
By extension this shows that using a stronger magnet material will allow the sensor to detect quadrature at greater distances as the magnetic flux density decreases as a function of distance.